On July 21 the Russian Ministry of Defense held a briefing and displayed the data to prove the fact that a number of Ukrainian Buk-M1 air defense systems were deployed in the vicinity of Donetsk at the time of Malaysian aircraft disaster. The 9С18 «Kupol» radar activities were especially intensive. It became known that a Ukrainian Su-25 was scrambled to accompany the airliner… The Russian system of air control detected the Ukrainian Air Force aircraft, supposedly the Su-25, ascending to the level of Malaysian Boeing-777. The distance between the aircraft was 3-5 kilometers. The Su-25 specifications allow it to fly at the altitude of 10000 meters for a short period of time. The plane is armed with air-to-air missile R-60 with a range of 12 kilometers, the operational range to make a sure hit is 5 kilometers. Why did the combat aircraft have to get up and fly along the civilian aviation route – that is the question to make clear.